US Bridges

STC3878;OLD HWY 95 over Weiser River

Fair

Washington County, Idaho · In Midvale · Structure no. 000000000020011

Built
1995
30 years old
Condition
Fair
inspected July 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
257 ft
2 main spans
Daily traffic
820
2023 count
Owner
County
County Highway Agency

About this bridge

STC3878;OLD HWY 95 over Weiser River is a prestressed concrete stringer/multi-beam or girder carrying STC3878;OLD HWY 95 over Weiser River in Washington County, Idaho. It was built in 1995, so it is 30 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 820 vehicles a day, roughly 6% of them trucks, projected to reach 1,230 by 2042. The structure is 257 ft (78.3 m) long and 39 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesSTC3878;OLD HWY 95
CrossesWeiser River
LocationIn Midvale
RouteCounty Highway 3878
CountyWashington County
StateIdaho
Coordinates44.47061, -116.73264
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length257 ft (78.3 m)
Longest span127 ft (38.7 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic820 (2023)
Projected traffic1,230 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3878;OLD HWY 95 over Weiser River built?

It was built in 1995, making it 30 years old in 2025.

What condition is STC3878;OLD HWY 95 over Weiser River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2022.

How much traffic does STC3878;OLD HWY 95 over Weiser River carry?

About 820 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is STC3878;OLD HWY 95 over Weiser River?

The structure is 257 ft (78.3 m) long with a longest span of 127 ft (38.7 m) and a deck 39 ft wide.

Who owns STC3878;OLD HWY 95 over Weiser River?

It is owned by the County Highway Agency.